User Manual

105
Lesson 21 Flame Sensor
Introduction
A flame sensor (as shown below) performs detection by capturing infrared rays with specific
wavelengths from flame. It can be used to detect and warn of flames.
Components
- 1 * Raspberry Pi
- 1 * Breadboard
- 4 * Jumper wires (Male to Male, 2 red and 2 black)
- 1 * Network cable (or USB wireless network adapter)
- 1 * Flame sensor module
- 1 * PCF8591
- 1 * 4-Pin anti-reverse cable
- Several Jumper wires (Male to Female)
Experimental Principle
There are several types of flame sensors. In this experiment, we will use a far-infrared flame
sensor. It can detect infrared rays with wavelength ranging from 700nm to 1000nm. A far-
infrared flame probe converts the strength changes of external infrared light into current
changes. And then it convert analog quantities into digital ones. In this experiment, connect
pin D0 of the Flame Sensor module to a GPIO of Raspberry Pi to detect by programming
whether any flame exists. The schematic diagram: